FacebookController.java example

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robonobo-master
package com.robonobo.midas.controller;

import java.io.IOException;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.codehaus.jackson.map.ObjectMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import com.restfb.*;
import com.restfb.types.User;
import com.robonobo.midas.FacebookService;
import com.robonobo.midas.model.MidasUser;
import com.robonobo.midas.model.MidasUserConfig;
import com.robonobo.remote.service.MidasService;

@Controller
@RequestMapping(value = "/fb-callback")
public class FacebookController extends BaseController {
	@Autowired
	FacebookService facebook;
	@Autowired
	MidasService midas;
	ObjectMapper jsonMapper = new ObjectMapper();

	@RequestMapping(method=RequestMethod.GET)
	public void facebookVerifyUrl(@RequestParam(value = "hub.challenge", required = false) String challenge,
			@RequestParam("hub.verify_token") String verifyToken, HttpServletRequest req, HttpServletResponse resp) throws IOException {
		if (!verifyToken.equals(facebook.getFacebookVerifyTok())) {
			// Someone is playing silly buggers, maybe?
			log.error("Facebook called back with invalid verify token " + verifyToken + " (was expecting "
					+ facebook.getFacebookVerifyTok() + ")");
			resp.setStatus(HttpServletResponse.SC_FORBIDDEN);
			return;
		}
		resp.getWriter().print(challenge);
	}
	
	@SuppressWarnings("unchecked")
	@RequestMapping(method=RequestMethod.POST)
	public void facebookDataChanged(HttpServletRequest req, HttpServletResponse resp)
			throws IOException {
		// Parse our json using the wonderful jackson library
		Map<String, Object> json;
		try {
			json = jsonMapper.readValue(req.getInputStream(), Map.class);
		} catch (Exception e) {
			throw new IOException(e);
		}
		if (!"user".equals(json.get("object")))
			throw new IOException("Invalid object in facebook callback: " + json.get("object"));
		List<Object> changedObjs = (List<Object>) json.get("entry");
		log.info("Facebook callback received with " + changedObjs.size() + " changed objects");
		for (Object obj : changedObjs) {
			Map<String, Object> changedObj = (Map<String, Object>) obj;
			String fbId = (String) changedObj.get("uid");
			MidasUserConfig muc = facebook.getUserConfigByFacebookId(fbId);
			if (muc == null)
				continue;
			List<Object> changedFields = (List<Object>) changedObj.get("changed_fields");
			for (Object field : changedFields) {
				if ("name".equals(field)) {
					FacebookClient fbCli = facebook.getFacebookClient(muc.getItem("facebookAccessToken"));
					User fbUser;
					try {
						fbUser = fbCli.fetchObject("me", User.class, Parameter.with("fields", "name"));
					} catch (FacebookException e) {
						throw new IOException(e);
					}
					facebook.updateFacebookName(fbId, fbUser.getName());
				} else if ("friends".equals(field)) {
					MidasUser user = midas.getUserById(muc.getUserId());
					facebook.updateFriends(user, muc);
				}
			}
		}
	}
}